<!DOCTYPE html>
<html>
    <body>
        <h1>hello</h1>
<!-- 
        <script>
            fetch('http://localhost:91/')
            .then(res=>res.text())
            .then(data=>alert(data))
        </script>
         -->
         <script>
             function f(data){
                 alert(data)

             }
             function f(data){
                 console.log(data);
                 
             }
         </script>
         <script src="http://localhost:91?callback=f"></script>
    </body>
</html>